According to a source close to the couple, the 32-year-old reality star's relationship with Tristan Thompson is heating up fast, and "if things keep going the way they're going," the NBA pro may put a ring on it sooner than we thought!

"Khloe and Tristan are doing so great and have an incredible relationship," the source revealed to ET on Thursday, adding, "There could be an engagement this summer."

The Revenge Body host isn't putting any pressure on her beau to get down on one knee, however.

"Khloe doesn't need a title to make their relationship real and she doesn't want to mess up how perfect it is now," the source said. "She's already done the marriage thing [with now ex-husband Lamar Odom]. Getting engaged is not something she's sitting around stressing about. If it happens, it happens, but it's not something she's stressing about right now."

Although Khloe's not too worried about getting a ring from Tristan, she is itching to start a family with the 25-year-old Cleveland Cavaliers star. The pro basketball player welcomed his first child, son Prince, back in December with his ex-girlfriend, Jordan Craig.

"Khloe is dying to have kids," the source tells ET. "It's something she's wanted for years, even with Lamar. Tristan just had a baby and Khloe sees how wonderful of a father he is. Khloe sees how close in age Kim, Kourtney and Rob Kardashian's children are and she wants the same."

"It's certainly a thought in her mind, but she isn't putting pressure on Tristan to give her that right now [either]," the source continues. "She doesn’t want anything to mess up what they have going on."

The source also told ET that the reason why Khloe and Tristan get along so well is because they "just vibe so well" together.

"Tristan is one of the nicest guys Khloe has ever met," the source gushes. "Khloe understands Tristan's crazy NBA schedule and tries to make it to Cleveland whenever he has a home stretch. She knows once the season is over, he will do the same for her. Their relationship is easy, and that's what she loves most about it."

Tristan and Khloe first sparked romance rumors last September, when they were spotted packing on the PDA in Miami, Florida. Since then, they haven't been shy about gushing over each other on social media.